Will there be any impact if a car that requires 92 octane fuel is filled with 95 octane?
2 Answers
A car that requires 92 octane fuel can be filled with 95 octane gasoline. 95 octane gasoline has higher purity than 92 octane, releasing more kinetic energy when burned in the engine. Therefore, in terms of the power provided by the fuel, higher fuel-saving performance will be highlighted. Reference for gasoline grade selection: The biggest difference between different grades of gasoline lies in their anti-knock performance, which is an important indicator for measuring fuel quality. Cars with an engine compression ratio between 8.6-9.9 should choose 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should choose 95 octane gasoline. If the compression ratio is even higher, 98 octane gasoline should be selected. Generally, the higher the gasoline grade, the higher the octane number and the better the anti-knock performance. Long-term effects of using the wrong gasoline grade: Using a higher octane fuel in a car designed for lower octane will not cause damage, but the increase in octane number will change the ignition point of the fuel, leading to delayed combustion in the engine. This means both the engine's power output and thermal efficiency will decrease. Conversely, using lower octane fuel in a car designed for higher octane can cause engine knocking, increased resistance during the upward stroke, and abnormal wear on the piston and cylinder. In severe cases, it can even lead to cylinder scoring.
I drove a car that usually takes 92-octane gasoline, and once the gas station didn't have 92, so I only filled up with 95-octane. After driving, I didn't feel any difference at all—the engine ran smoothly, and the power and fuel consumption were exactly the same as before, except I spent a few dozen yuan more. I talked to a friend about it, and he said the main difference between 92 and 95 is the anti-knock performance, with 95 having slightly better knock resistance, which is beneficial and harmless to the car. However, it's best to follow the manual's recommendations, and upgrading isn't necessary. Remember, occasionally using 95-octane won't harm your car—just your wallet will be a bit lighter.
